/Engine/Source/Runtime/Core/Public/HAL/RunnableThread.h
Creates the thread with the specified stack size and thread priority.
True if the thread and all of its initialization was successful, false otherwise
bool CreateInternal ( [FRunnable](API\Runtime\Core\HAL\FRunnable) * InRunnable, const TCHAR * InThreadName, uint32 InStackSize, EThreadPriority InThreadPri, uint64 InThreadAffinityMask, EThreadCreateFlags InCreateFlags )